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Function Block For Using Integrated Serial Port With SYSMAC Way on CJ1 and CS1 PLCs

Function Block for SYSMAC WAY communication.
The Function Block (FB) attached exploits the Hostlink communication protocol. The master PLC can send messages for reading and writing to CIO and DM areas on a Sysmac Way network. The maximum number of connectable units connectable is 32. The FB uses the integrated serial port on CJ1 and CS1 PLCs.
Required Hardware and Software
PLC - To use the lock function it is necessary to have the CS1 or CJ1 series firmware version 3.0 or later.
To use the software block you need to use CX-Programmer 5.0 or CX-One.

Importing a Function Block in CX-Programmer

Right click on "Function Blocks"

From the context menu, select "Insert Block function" and then select the option "From
file ... "

Navigate to the folder in which they were
copied and select the function block

Configuring the RS232 port on the PLC Master

The serial port configuration is done
through the settings editor of the PLC.
Double-click on the "Settings".
In the settings of the PLC,
"Port Host Link"
After setting the parameters
select the configuration
under "Transfer to PLC from the
options menu. The PLC must
be in "Program".

Parameter Descriptions

Communication Settings To change the port configuration it is necessary to select "Personal"
Speed Communication speed is adjustable from 300 to 115,200 baud
according to the specifications of the slave
Format Set the combination of Data Bits, Stop Bits and parity
necessary for communication with the slaves. The
default for the Hostlink protocol is 7.2, ie E 7 Data Bits,
2 stop bits and parity Equal (E).
Mode Select the "RS-232C"
Order Code Select the "Code Set" and set the code
Delay Transmission delay specified by the user, leave at 0


Input Parameters:

Name Type Description
EN BOOL Enabling input of function block. For a proper operation, it must
be kept high for the duration of the communication. The input can
be connected to the Bit P_On.
Slave_Table UINT
The value represents the address of a word in the Data Memory. The
table definition determines the operation (read / write) and
information necessary for data exchange. The structure of the table is
illustrated below.
Blocks UINT Number of blocks definition (> 0) The FB does not provide
an upper limit of blocks.
Timeout WORD Waiting time for the slaves response expressed in tenths of
second. If set to 0 the default will be20 (2


Name Type Description
ENO BOOL This output reflects the state of entry EN and then the state of the enabled function block
Error BOOL If you make a mistake in carrying out the sequence of communication Bit
is increased to the same On and updates the contents of ERROR_CODE word.
Error_Code WORD This output word contains a code that allows you to trace the cause
of communication error.  
Current_Block WORD This output indicates the number of the block definition in the course of
processing. The numbering starts at 0.
Slave_Ok DWORD

The 32 Bit represents Hostlink nodes from 0 to 31. If the bit is 1 it means that
node exchanged data with the master. If the bit is 0 it means that the master does not or
has never communicated with that node, or there was an error in exchanging data. 

Bit 15 14 13 ... 2 1 0
Slave_Ok 15 14 13 ... 2 1 0
Slave_Ok+1 31 30 29 ... 18 17 16


Slave_Error DWORD

The 32 Bit represents Hostlink nodes from 0 to 31. The state of Bit 1 indicates a
communication error with the corresponding node. The Bit 0 indicates no errors. When communication is restored with a Slave, the Bit correspondingly changes from 1 to 0.

Bit 15 14 13 ... 2 1 0
Slave_Ok 15 14 13 ... 2 1 0
Slave_Ok+1 31 30 29 ... 18 17 16


Slave Definitions

Word Description
n Node number 0 - 31 (00 - 1F hex)
n+1 Command 1-4, see table commands
n+2 Word starting from 0 to 9999 (0000 - 270F hex)
n+3 Number of word from 1 to 30 (0000 - 001E hex)
n+4 Address of the first word of data exchange in PLCs. From 00,000 to 32,767 per
read / write access to the area D, from 0000 to 6143 for operations on CIO.

Supported Hostlink Commands

Command Code Hostlink Command Description
01 RR Read the CIO (IR on PLC series C).
02 RD Reading the Data Memory
03 WR Writing of the CIO (IR on PLC Series C)
04 WD Writing of the Data Memory

Error Codes

Code (Hex) Description
0000 No errors
E000 Timeout, the slave did not respond within the allotted time (default 2 sec)
E001 FCS error in the received message
E002 Modbus slave address out of range (> 31)
E003 The command is not defined
E004 Modbus slave address out of range (> 247)
E005 Number of records / Bit too high (> 30) or equal to 0
EE01 Command not executable in RUN mode
EE04 The address does not exist in the slave device
EE13 FCS error in the message that the slave device has received
EE14 The format of the message is not supported by slave
EE15 The amount of data is outside the range allowed by the slave
EE16 Command not supported by slave
EE19 Operation unworkable
EE21 an error in the CPU prevents the response

Using the SYSWAY Function Block

The function block uses the RS232 serial port of the CPU, so it is possible to use only one FB. If you wish to use multiple instances of the same block, they must be mutually
exclusive. Two or more Master Sysway FBs can not operate on a single port.

The definition of data exchange between master and slave is done by means of a table composed of definition blocks. Each block, consisting of 5 words, defines the number of slave node, the command to perform (read / write data area and CIO / D), the source address of the number of words exchanged, and the first word of data exchange on the master. There is no limit to the number of definition blocks set. For each transaction read or write, you can exchange a 30-word maximum.

For diagnosis there is a generic error bit that occurs in case of a communication error. The "ERROR_CODE" contains the specific error code The description of the errors can be found above. It comes as two double words representing the state of slave. The Bit 0 to 31 of each word represents Hostlink nodes from 0 to 31. The word "Slave_Ok" indicates which slave is exchanging data with the Master while the word "Slave_Error" indicates that the slave reported errors of communication.

The setting range of addresses for data areas and CIO Data Memory is adjustable from 0 to 9999. The actual availability of such guidelines in the slave depends on the specifics
of the device. An attempt to access areas outside the area will result in an error code "EEyy".


The input "EN" in the function block must be connected to an On Bit and remain so for the entire duration of the block's operations. It uses the Bit "P_On" (Always On).

An example of the Function Block's use.

Example of table definition of the exchange data

Example 1. Reading / writing to the same area on multiple nodes.

The master is connected to (three) PLCs configured as slaves with node numbers 0 and 1. The slaves read 20 words starting at D100 and write 4 words of I/O starting at CIO200. Master data from D will be placed from D7500 and the data of the CIO starting from 3200.
The beginning of the table definition is placed at D1200.

Address Value (HEX) Description
D1200 0(0000) Node 0
D1201 2(0002) D area
D1202 100(0064) Word starts D100
D1203 20(0014) Number word = 20
D1204 7500(1D4C) Address in Master D7500
D1205 0(0000) Node 0
D1206 3(0003) Writing CIO area
D1207 200(00C8) Word starts CIO200
D1208 4(0004) Number word = 4
D1209 3200(0C80) Address in Master CIO3200
D1210 1(0001) Node 1
D1211 2(0002) D area
D1212 100(0064) Word starts D100
D1213 20(0014) Number word = 20
D1214 7520(1D60) Address in Master D7520
D1215 1(0001) Node 1
D1216 3(0003) Writing CIO area
D1217 200(00C8) Word starts CIO200
D1218 4(0004) Number word = 4
D1219 3204(0C84) Address in Master CIO3204

Example2. Read / write data to more areas on the same node.

The master is connected to a single slave (node 0) from which it reads 10 CIO words starting from CIO0, reads 25 words from D500, writes 8 words from CIO10 and 40 words from D1000.
When reading, the data will be starting from CIO6000 to D2500. For
writing the data starts from D10300.
The beginning of the table of definitions is placed at D100

Address Value (HEX) Description
D100 0(0000) Node 0
D101 1(0001) CIO area
D102 0(0000) Word starts CIO0000
D103 10(000A) Number word = 10
D104 6000(1770) Address in Master CIO6000
D105 6(0006) Node 0
D106 2(0002) D area
D107 500(01F4) Word starts D500
D108 25(0019) Number word = 25
D109 2500(09C4) Address in Master D2500
D110 0(0000) Node 0
D111 3(0003) Writing CIO area
D112 10(000A) Word starts CIO10
D113 8(0008) Number word = 8
D114 5230(146E) Address in Master CIO5230
D115 0(0000) Node 0
D116 4(0004) D area
D117 1000(03E8) Word starts D1000
D118 30(001E) Number word = 30
D119 10300(283C) Address in Master D10300
D120 0(0000) Node 0
D121 4(0004) D area
D122 1030(0406) Word starts D1030
D123 10(000A) Number word = 10
D124 10330(285A) Address in Master D10330

Setting the slave PLC

If the device is a slave Omron PLC, you must configure the communication port as follows:

Set Communication (A) parameters to adapt them to your Master.
Select the mode (B) on "Host link".
If the connection is made with more than one slave, assign
each node a number of  between 0 and 31 (C).
To write data in the areas of
Slave PLC, the operating mode
PLC at (A) should
be set to "Monitor".

Examples of Wiring

Note: It is recommended to use the converter SYS-SCU02-OEE-I. For PLC CP1H series and CP1L you can use the adapter CP1W-CIF11.

Pinout of the RS232 port of the PLC

Pin No. Signal Name Direction
1 FG Protection earth ---
2 SD(TXD) Send data Output
3 RD(RXD) Receive data Input
4 RS(RTS) Request to send Output
5 CS(CTS) Clear to send Input
6 5V Power supply ---
7 DR(DSR) Data set ready Input
8 ER(DTR) Data terminal ready Output
9 SG(OV) Signal ground ---
Connector Hood FG Protection earth ---

RS232 connection point to point.

CP1W-SCU11 Adapter

CP1H and CP1L series PLCs can use this form of communication in place of the standard RS232.

Pin Setting
1 ON Inserted Termination resistance
OFF Not inserted
2 ON Wires Mode selection: RS422 (4 wire) or RS485 (2 wires)
OFF Wires
3 ON Wires Mode selection: RS422 (4 wire) or RS485 (2 wires)
OFF Wires
4   Not used
5 ON RTS Control enabled Direction control (RTS) for receiving
OFF RTS Control not enabled
6 ON RTS Control enabled Direction control (RTS) for the transmission
OFF RTS Control not enabled

RS422: To work set the pin 6 to ON, the pin 2, 3 and 5 to OFF. Pin 1 must be
ON if the device is one of the ends of the network.
RS485: To  work set pins 2, 3, 5, 6 to ON. Pin 1 must be ON if the
device is one of the ends of the network.

Connection between the nodes.
SYS-converter SCU02-OEE-I



fb_sysway_master_232.cxp - Size: 12649

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Created 2009-05-07
Modified 2009-05-15
Views 13957


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